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Features. Reproductive cells, or gametes, have half of the genetic information required to form a new individual; thus, the meeting of a sperm with an egg results in a full set of chromosomes. Mature mammalian egg cells are relatively large--0.0039 inches. in diameter--and contain many proteins and protein precursors.This is because when a sperm cell introduces its genetic information to that of the egg, the egg must respond quickly so that cell division may begin and a new organism may form.vulation. Egg cells are found in a special place within the body called ovaries. A woman is born with all of the egg cells she will ever have, but they do not present themselves for fertilization until after puberty. This is when ovulation first occurs.
The Cell Nucleus The nucleus is a highly specialized organelle that serves as the information processing and administrative center of the cell. This organelle has two major functions: it stores the cell's hereditary material, or DNA, and it coordinates the cell's activities, which include growth, intermediary metabolism, protein synthesis, and reproduction (cell division). Only the cells of advanced organisms, known as eukaryotes, have a nucleus. Generally there is only one nucleus per cell, but there are exceptions, such as the cells of slime molds and the Siphonales group of algae. Simpler one-celled organisms (prokaryotes), like the bacteria and cyanobacteria, don't have a nucleus.